Journal Article

A spectroscopic study of the blue stragglers in M67

G. Q. Liu, L. Deng, M. Chávez, E. Bertone, A. Herrero Davo and M. D. Mata-Chávez

in Monthly Notices of the Royal Astronomical Society

Published on behalf of The Royal Astronomical Society

Volume 390, issue 2, pages 665-674
Published in print October 2008 | ISSN: 0035-8711
Published online October 2008 | e-ISSN: 1365-2966 | DOI: http://dx.doi.org/10.1111/j.1365-2966.2008.13741.x
A spectroscopic study of the blue stragglers in M67

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Based on spectrophotometric observations from the Guillermo Haro Observatory (Cananea, Mexico), a study of the spectral properties of the complete sample of 24 blue straggler stars (BSs) in the old Galactic open cluster M67 (NGC 2682) is presented. All spectra, calibrated using spectral standards, were recalibrated by means of photometric magnitudes in the Beijing–Arizona–Taipei–Connecticut system, which includes fluxes in 11 bands covering ∼3500–10 000 Å. The set of parameters was obtained using two complementary approaches that rely on a comparison of the spectra with (i) an empirical sample of stars with well-established spectral types and (ii) a theoretical grid of optical spectra computed at both low and high resolution. The overall results indicate that the BSs in M67 span a wide range in Teff(∼ 5600 –126 00 K) and surface gravities that are fully compatible with those expected for main-sequence objects (log g= 3.5 –5.0 dex).

Keywords: blue stragglers; Hertzsprung–Russell (HR) diagram; open clusters and associations: individual: M67

Journal Article.  5678 words.  Illustrated.

Subjects: Astronomy and Astrophysics

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